<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="https://cdn.jsdelivr.net/npm/vue@2.7.10/dist/vue.js"></script>
    <title>Document</title>
</head>
<body>
    <div id="app">
        <h1>{{title}}</h1>
    </div>
    <script>
        const vm = new Vue({
            // 容器
            // el : "#app",
            // 数据对象
            data:{
                title:'第一个Vue',
                msg:'hello'
            }
        })

        // $mount 可延迟挂载，效率无区别
        setTimeout(()=>{
            vm.$mount ("#app");
        },2000)
    </script>
</body>
</html>